$-3=2\left(1+\frac{dx}{dy}\right)$

$\frac{d^2}{dx^2}\frac{\left(x+1\right)^2}{\left(x-1\right)}$

$\int\:\frac{y^3}{\left(1-2y^4\right)^5}dy$

$\int\left(\frac{e^y}{e^y+1}\right)dy$

$\lim_{x\to0}\left(\frac{e^{x^2}-x^2-1}{sen\left(x^2\right)}\right)$

$5x-7+3x\:and\:-\:7\:+\:5x$

$\frac{dy}{dx}=2y+e^{3x}$